package com.example.blog.utils;

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.JwtParser;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.io.Decoders;
import io.jsonwebtoken.security.Keys;
import lombok.extern.slf4j.Slf4j;
import org.apache.ibatis.annotations.Select;

import java.security.Key;
import java.util.Date;
import java.util.Map;

/**
 * ClassName: JwtUtil
 * Package: IntelliJ IDEA
 * Description:
 *
 * @Author 谷京京
 * @Create 2024/3/26 23:09
 * @Version 1.0
 */
@Slf4j
public class JwtUtil {
    private static final long expiration = 60 * 60 * 1000;
    private static final String secretString = "LuluX0SX3GfhLTvzc0DVDS4Dn9nEbJbPjMrWJjWIoQw=";
    private static final Key KEY = Keys.hmacShaKeyFor(Decoders.BASE64.decode(secretString));

    public static String genToken(Map<String, Object> claim) {
        return Jwts.builder()
                .setClaims(claim)//设置自定义信息
                .setExpiration(new Date(System.currentTimeMillis() + expiration))//设置过期时间
                .signWith(KEY)//设置签名
                .compact();
    }
    public static Claims parseToken(String token) {
        if(token == null) {
            return null;
        }
        JwtParser build = Jwts.parserBuilder().setSigningKey(KEY).build();
        Claims claims = null;
        try {
            claims = build.parseClaimsJws(token).getBody();
        } catch (Exception e) {
            log.error("解析token失败, token:"+ token);
        }
        return claims;
    }
    public static Integer getUserIdFromToken(String token) {
        Claims claims = parseToken(token);
        if (claims == null) {
            return null;
        }
        return (Integer) claims.get("id");
    }
}
